Error code on homepage !

[Ali777]

Hi,

I'm new to prestashop, I need to check for the cause for a "non working" prestashop site with this error massage at the homepage :

"Fatal error: Uncaught Error: [] operator not supported for strings in /home1/bluestorm/public_html/classes/db/DbQuery.php:96 Stack trace: #0 /home1/bluestorm/public_html/Adapter/Adapter_EntityMapper.php(45): DbQueryCore->from('shop', 'a') #1 /home1/bluestorm/public_html/classes/ObjectModel.php(233): Adapter_EntityMapper->load('1', NULL, Object(Shop), Array, NULL, true) #2 /home1/bluestorm/public_html/classes/shop/Shop.php(131): ObjectModelCore->__construct('1', NULL, NULL) #3 /home1/bluestorm/public_html/classes/shop/Shop.php(397): ShopCore->__construct('1') #4 /home1/bluestorm/public_html/config/config.inc.php(114): ShopCore::initialize() #5 /home1/bluestorm/public_html/index.php(27): require('/home1/bluestor...') #6 {main} thrown in /home1/bluestorm/public_html/classes/db/DbQuery.php on line 96"

can any one help what is this error ?

thank you.